Hello, this is my first time writing on here so hopefully I can find what I am looking for. I bought an old Martin 40 at a garage sale and the guy said it would need an impeller. I have been looking for a few days now and it seems it might be more difficult than I thought. Can anyone help me with finding an impeller that will work? It looks like the original impeller if not a rotor impeller, but rather a thick rubber piece that goes around the crankshaft. Is there an aftermarket part that would work for this or am I S.O.L? Thanks,